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Car makers in the US are realising that the speedy delivery of parts can be something of a risky business. If supplies are cut off, assembly lines can grind to a halt  – ultimately costing far more than having big stockpiles on the books and in the warehouse. The Huffington Post neatly explains the history of the just-in-time philosophy, and shows how, as part makers continue to close down, the supply chain is becoming more fragile.